The Tamron SP 70-200mm f2.8 Di VC USD Canon has a DxOMark score of 25. This is the second highest score in DxOMark listings for any zoom lens mounted on a Canon EOS 1Ds Mark III camera and the highest for a lens of this zoom range. The sharpness score is 17 P-Mpix, Distortion is 0.2%, and Transmission at 3.1TStop is very close to the actual aperture of f2.8, which is impressive in a lens with so many elements. Chromatic aberration is 7µm and Vignetting is -1.4EV. These are very good scores indeed, individually there are measures that are beaten by other similar lenses but taken as a whole the Tamron 70-200 is a quality lens.

Further readings for the Tamron SP 70-200mm f2.8 Di VC USD Canon review - Excellent Value and a Great All Rounder

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